Dry vagina few days before period starts. is this normal?

Well reported: Probably related to hormonal variations just prior to period but in your specific case the best way to deal with this is to see a gynecologist and be examined. Although not certain you will get a specific reason identified, at least you will learn whether there are any abnormalities to be concerned about. Good luck.

Unusual : It has been reported with the drops in estrogen at this time and is considered normal. Don't worry, just use lubricant if needed.